43218216 has 144 divisors (see below), whose sum is σ = 130266240. Its totient is φ = 12925440.

The previous prime is 43218181. The next prime is 43218221. The reversal of 43218216 is 61281234.

43218216 is a `hidden beast` number, since 432 + 18 + 216 = 666.

It is a nude number because it is divisible by every one of its digits.

Its product of digits (2304) is a multiple of the sum of its prime factors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 43218216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 645015 + ... + 645081.

Almost surely, 2^43218216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43218216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65133120).

43218216 is an abundant number, since it is smaller than the sum of its proper divisors (87048024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43218216 is a wasteful number, since it uses less digits than its factorization.

43218216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 120 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 43218216 is about 6574.0562820834. The cubic root of 43218216 is about 350.9314400877.

It can be divided in two parts, 43218 and 216, that added together give a palindrome (43434).

The spelling of 43218216 in words is "forty-three million, two hundred eighteen thousand, two hundred sixteen".